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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: ObjIdBiMultiMap.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.util;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import org.jsimpledb.core.ObjId;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>/**<a name="line.12"></a>
<span class="sourceLineNo">013</span> * A bi-directional, many-to-many mapping between {@link ObjId}s.<a name="line.13"></a>
<span class="sourceLineNo">014</span> *<a name="line.14"></a>
<span class="sourceLineNo">015</span> * &lt;p&gt;<a name="line.15"></a>
<span class="sourceLineNo">016</span> * Instances can be thought of as containing a set of &lt;i&gt;source, target&lt;/i&gt; ordered pairs.<a name="line.16"></a>
<span class="sourceLineNo">017</span> * The many-to-many mapping can be efficiently queried and modified from either direction.<a name="line.17"></a>
<span class="sourceLineNo">018</span> * &lt;/p&gt;<a name="line.18"></a>
<span class="sourceLineNo">019</span> *<a name="line.19"></a>
<span class="sourceLineNo">020</span> * &lt;p&gt;<a name="line.20"></a>
<span class="sourceLineNo">021</span> * Instances of this class are thread-safe.<a name="line.21"></a>
<span class="sourceLineNo">022</span> * &lt;/p&gt;<a name="line.22"></a>
<span class="sourceLineNo">023</span> */<a name="line.23"></a>
<span class="sourceLineNo">024</span>public class ObjIdBiMultiMap {<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>    private final Object lock;                      // we always synchronized on this object<a name="line.26"></a>
<span class="sourceLineNo">027</span>    private final ObjIdBiMultiMap inverse;          // if not null, this is my inverse<a name="line.27"></a>
<span class="sourceLineNo">028</span>    private /*final*/ ObjIdMap&lt;ObjIdSet&gt; forward;<a name="line.28"></a>
<span class="sourceLineNo">029</span>    private /*final*/ ObjIdMap&lt;ObjIdSet&gt; reverse;<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>// Constructors<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span>    /**<a name="line.33"></a>
<span class="sourceLineNo">034</span>     * Default constructor.<a name="line.34"></a>
<span class="sourceLineNo">035</span>     */<a name="line.35"></a>
<span class="sourceLineNo">036</span>    public ObjIdBiMultiMap() {<a name="line.36"></a>
<span class="sourceLineNo">037</span>        this(0, 0);<a name="line.37"></a>
<span class="sourceLineNo">038</span>    }<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>    /**<a name="line.40"></a>
<span class="sourceLineNo">041</span>     * Constructs an instance with the given initial capacities.<a name="line.41"></a>
<span class="sourceLineNo">042</span>     *<a name="line.42"></a>
<span class="sourceLineNo">043</span>     * @param sourceCapacity initial capacity for the number of sources<a name="line.43"></a>
<span class="sourceLineNo">044</span>     * @param targetCapacity initial capacity for the number of targets<a name="line.44"></a>
<span class="sourceLineNo">045</span>     * @throws IllegalArgumentException if either value is negative<a name="line.45"></a>
<span class="sourceLineNo">046</span>     */<a name="line.46"></a>
<span class="sourceLineNo">047</span>    public ObjIdBiMultiMap(int sourceCapacity, int targetCapacity) {<a name="line.47"></a>
<span class="sourceLineNo">048</span>        this(null, new ObjIdMap&lt;ObjIdSet&gt;(sourceCapacity), new ObjIdMap&lt;ObjIdSet&gt;(targetCapacity));<a name="line.48"></a>
<span class="sourceLineNo">049</span>    }<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span>    // Internal constructor<a name="line.51"></a>
<span class="sourceLineNo">052</span>    private ObjIdBiMultiMap(ObjIdBiMultiMap inverse, ObjIdMap&lt;ObjIdSet&gt; forward, ObjIdMap&lt;ObjIdSet&gt; reverse) {<a name="line.52"></a>
<span class="sourceLineNo">053</span>        if (inverse != null) {<a name="line.53"></a>
<span class="sourceLineNo">054</span>            this.lock = inverse.lock;<a name="line.54"></a>
<span class="sourceLineNo">055</span>            this.inverse = inverse;<a name="line.55"></a>
<span class="sourceLineNo">056</span>        } else {<a name="line.56"></a>
<span class="sourceLineNo">057</span>            this.lock = new Object();<a name="line.57"></a>
<span class="sourceLineNo">058</span>            this.inverse = null;<a name="line.58"></a>
<span class="sourceLineNo">059</span>        }<a name="line.59"></a>
<span class="sourceLineNo">060</span>        this.forward = forward;<a name="line.60"></a>
<span class="sourceLineNo">061</span>        this.reverse = reverse;<a name="line.61"></a>
<span class="sourceLineNo">062</span>        synchronized (this) { }<a name="line.62"></a>
<span class="sourceLineNo">063</span>    }<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span>// Public methods<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>    /**<a name="line.67"></a>
<span class="sourceLineNo">068</span>     * Get the the number of sources that have one or more associated targets.<a name="line.68"></a>
<span class="sourceLineNo">069</span>     *<a name="line.69"></a>
<span class="sourceLineNo">070</span>     * @return the number of sources contained in this instance<a name="line.70"></a>
<span class="sourceLineNo">071</span>     */<a name="line.71"></a>
<span class="sourceLineNo">072</span>    public int getNumSources() {<a name="line.72"></a>
<span class="sourceLineNo">073</span>        synchronized (this.lock) {<a name="line.73"></a>
<span class="sourceLineNo">074</span>            return this.forward.size();<a name="line.74"></a>
<span class="sourceLineNo">075</span>        }<a name="line.75"></a>
<span class="sourceLineNo">076</span>    }<a name="line.76"></a>
<span class="sourceLineNo">077</span><a name="line.77"></a>
<span class="sourceLineNo">078</span>    /**<a name="line.78"></a>
<span class="sourceLineNo">079</span>     * Get the the number of targets that have one or more associated sources.<a name="line.79"></a>
<span class="sourceLineNo">080</span>     *<a name="line.80"></a>
<span class="sourceLineNo">081</span>     * @return the number of targets contained in this instance<a name="line.81"></a>
<span class="sourceLineNo">082</span>     */<a name="line.82"></a>
<span class="sourceLineNo">083</span>    public int getNumTargets() {<a name="line.83"></a>
<span class="sourceLineNo">084</span>        synchronized (this.lock) {<a name="line.84"></a>
<span class="sourceLineNo">085</span>            return this.reverse.size();<a name="line.85"></a>
<span class="sourceLineNo">086</span>        }<a name="line.86"></a>
<span class="sourceLineNo">087</span>    }<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span>    /**<a name="line.89"></a>
<span class="sourceLineNo">090</span>     * Get all sources associated with this instance that have one or more associated targets.<a name="line.90"></a>
<span class="sourceLineNo">091</span>     *<a name="line.91"></a>
<span class="sourceLineNo">092</span>     * &lt;p&gt;<a name="line.92"></a>
<span class="sourceLineNo">093</span>     * The returned {@link ObjIdSet} is mutable, but changes to it do not affect this instance.<a name="line.93"></a>
<span class="sourceLineNo">094</span>     * &lt;/p&gt;<a name="line.94"></a>
<span class="sourceLineNo">095</span>     *<a name="line.95"></a>
<span class="sourceLineNo">096</span>     * @return all source ID's associated with this instance, possibly empty<a name="line.96"></a>
<span class="sourceLineNo">097</span>     */<a name="line.97"></a>
<span class="sourceLineNo">098</span>    public ObjIdSet getSources() {<a name="line.98"></a>
<span class="sourceLineNo">099</span>        synchronized (this.lock) {<a name="line.99"></a>
<span class="sourceLineNo">100</span>            return this.forward.keySet().clone();<a name="line.100"></a>
<span class="sourceLineNo">101</span>        }<a name="line.101"></a>
<span class="sourceLineNo">102</span>    }<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span>    /**<a name="line.104"></a>
<span class="sourceLineNo">105</span>     * Get all targets associated with this instance that have one or more associated sources.<a name="line.105"></a>
<span class="sourceLineNo">106</span>     *<a name="line.106"></a>
<span class="sourceLineNo">107</span>     * &lt;p&gt;<a name="line.107"></a>
<span class="sourceLineNo">108</span>     * The returned {@link ObjIdSet} is mutable, but changes to it do not affect this instance.<a name="line.108"></a>
<span class="sourceLineNo">109</span>     * &lt;/p&gt;<a name="line.109"></a>
<span class="sourceLineNo">110</span>     *<a name="line.110"></a>
<span class="sourceLineNo">111</span>     * @return all targets ID's associated with this instance, possibly empty<a name="line.111"></a>
<span class="sourceLineNo">112</span>     */<a name="line.112"></a>
<span class="sourceLineNo">113</span>    public ObjIdSet getTargets() {<a name="line.113"></a>
<span class="sourceLineNo">114</span>        synchronized (this.lock) {<a name="line.114"></a>
<span class="sourceLineNo">115</span>            return this.reverse.keySet().clone();<a name="line.115"></a>
<span class="sourceLineNo">116</span>        }<a name="line.116"></a>
<span class="sourceLineNo">117</span>    }<a name="line.117"></a>
<span class="sourceLineNo">118</span><a name="line.118"></a>
<span class="sourceLineNo">119</span>    /**<a name="line.119"></a>
<span class="sourceLineNo">120</span>     * Get the sources associated with the given target, if any.<a name="line.120"></a>
<span class="sourceLineNo">121</span>     *<a name="line.121"></a>
<span class="sourceLineNo">122</span>     * &lt;p&gt;<a name="line.122"></a>
<span class="sourceLineNo">123</span>     * The returned {@link ObjIdSet} is mutable, but changes to it do not affect this instance.<a name="line.123"></a>
<span class="sourceLineNo">124</span>     * &lt;/p&gt;<a name="line.124"></a>
<span class="sourceLineNo">125</span>     *<a name="line.125"></a>
<span class="sourceLineNo">126</span>     * @param target target ID<a name="line.126"></a>
<span class="sourceLineNo">127</span>     * @return one or more source ID's associated with {@code target}, or null if there are none<a name="line.127"></a>
<span class="sourceLineNo">128</span>     * @throws IllegalArgumentException if {@code target} is null<a name="line.128"></a>
<span class="sourceLineNo">129</span>     */<a name="line.129"></a>
<span class="sourceLineNo">130</span>    public ObjIdSet getSources(ObjId target) {<a name="line.130"></a>
<span class="sourceLineNo">131</span>        if (target == null)<a name="line.131"></a>
<span class="sourceLineNo">132</span>            throw new IllegalArgumentException("null target");<a name="line.132"></a>
<span class="sourceLineNo">133</span>        synchronized (this.lock) {<a name="line.133"></a>
<span class="sourceLineNo">134</span>            final ObjIdSet sources = this.reverse.get(target);<a name="line.134"></a>
<span class="sourceLineNo">135</span>            return sources != null ? sources.clone() : null;<a name="line.135"></a>
<span class="sourceLineNo">136</span>        }<a name="line.136"></a>
<span class="sourceLineNo">137</span>    }<a name="line.137"></a>
<span class="sourceLineNo">138</span><a name="line.138"></a>
<span class="sourceLineNo">139</span>    /**<a name="line.139"></a>
<span class="sourceLineNo">140</span>     * Get the targets associated with the given source, if any.<a name="line.140"></a>
<span class="sourceLineNo">141</span>     *<a name="line.141"></a>
<span class="sourceLineNo">142</span>     * &lt;p&gt;<a name="line.142"></a>
<span class="sourceLineNo">143</span>     * The returned {@link ObjIdSet} is mutable, but changes to it do not affect this instance.<a name="line.143"></a>
<span class="sourceLineNo">144</span>     * &lt;/p&gt;<a name="line.144"></a>
<span class="sourceLineNo">145</span>     *<a name="line.145"></a>
<span class="sourceLineNo">146</span>     * @param source source ID<a name="line.146"></a>
<span class="sourceLineNo">147</span>     * @return one or more target ID's associated with {@code source}, or null if there are none<a name="line.147"></a>
<span class="sourceLineNo">148</span>     * @throws IllegalArgumentException if {@code source} is null<a name="line.148"></a>
<span class="sourceLineNo">149</span>     */<a name="line.149"></a>
<span class="sourceLineNo">150</span>    public ObjIdSet getTargets(ObjId source) {<a name="line.150"></a>
<span class="sourceLineNo">151</span>        if (source == null)<a name="line.151"></a>
<span class="sourceLineNo">152</span>            throw new IllegalArgumentException("null source");<a name="line.152"></a>
<span class="sourceLineNo">153</span>        synchronized (this.lock) {<a name="line.153"></a>
<span class="sourceLineNo">154</span>            final ObjIdSet targets = this.forward.get(source);<a name="line.154"></a>
<span class="sourceLineNo">155</span>            return targets != null ? targets.clone() : null;<a name="line.155"></a>
<span class="sourceLineNo">156</span>        }<a name="line.156"></a>
<span class="sourceLineNo">157</span>    }<a name="line.157"></a>
<span class="sourceLineNo">158</span><a name="line.158"></a>
<span class="sourceLineNo">159</span>    /**<a name="line.159"></a>
<span class="sourceLineNo">160</span>     * Determine if this instance has any targets associated with the specified source.<a name="line.160"></a>
<span class="sourceLineNo">161</span>     *<a name="line.161"></a>
<span class="sourceLineNo">162</span>     * @param source source ID<a name="line.162"></a>
<span class="sourceLineNo">163</span>     * @return true if any target ID's are associated with {@code source}, otherwise false<a name="line.163"></a>
<span class="sourceLineNo">164</span>     * @throws IllegalArgumentException if {@code source} is null<a name="line.164"></a>
<span class="sourceLineNo">165</span>     */<a name="line.165"></a>
<span class="sourceLineNo">166</span>    public boolean containsSource(ObjId source) {<a name="line.166"></a>
<span class="sourceLineNo">167</span>        if (source == null)<a name="line.167"></a>
<span class="sourceLineNo">168</span>            throw new IllegalArgumentException("null source");<a name="line.168"></a>
<span class="sourceLineNo">169</span>        synchronized (this.lock) {<a name="line.169"></a>
<span class="sourceLineNo">170</span>            return this.forward.containsKey(source);<a name="line.170"></a>
<span class="sourceLineNo">171</span>        }<a name="line.171"></a>
<span class="sourceLineNo">172</span>    }<a name="line.172"></a>
<span class="sourceLineNo">173</span><a name="line.173"></a>
<span class="sourceLineNo">174</span>    /**<a name="line.174"></a>
<span class="sourceLineNo">175</span>     * Determine if this instance has any sources associated with the specified target.<a name="line.175"></a>
<span class="sourceLineNo">176</span>     *<a name="line.176"></a>
<span class="sourceLineNo">177</span>     * @param target target ID<a name="line.177"></a>
<span class="sourceLineNo">178</span>     * @return true if any source ID's are associated with {@code target}, otherwise false<a name="line.178"></a>
<span class="sourceLineNo">179</span>     * @throws IllegalArgumentException if {@code target} is null<a name="line.179"></a>
<span class="sourceLineNo">180</span>     */<a name="line.180"></a>
<span class="sourceLineNo">181</span>    public boolean containsTarget(ObjId target) {<a name="line.181"></a>
<span class="sourceLineNo">182</span>        if (target == null)<a name="line.182"></a>
<span class="sourceLineNo">183</span>            throw new IllegalArgumentException("null target");<a name="line.183"></a>
<span class="sourceLineNo">184</span>        synchronized (this.lock) {<a name="line.184"></a>
<span class="sourceLineNo">185</span>            return this.reverse.containsKey(target);<a name="line.185"></a>
<span class="sourceLineNo">186</span>        }<a name="line.186"></a>
<span class="sourceLineNo">187</span>    }<a name="line.187"></a>
<span class="sourceLineNo">188</span><a name="line.188"></a>
<span class="sourceLineNo">189</span>    /**<a name="line.189"></a>
<span class="sourceLineNo">190</span>     * Add an association.<a name="line.190"></a>
<span class="sourceLineNo">191</span>     *<a name="line.191"></a>
<span class="sourceLineNo">192</span>     * @param source source ID<a name="line.192"></a>
<span class="sourceLineNo">193</span>     * @param target target ID<a name="line.193"></a>
<span class="sourceLineNo">194</span>     * @return true if association was added, false if the association already existed<a name="line.194"></a>
<span class="sourceLineNo">195</span>     * @throws IllegalArgumentException if {@code source} or {@code target} is null<a name="line.195"></a>
<span class="sourceLineNo">196</span>     */<a name="line.196"></a>
<span class="sourceLineNo">197</span>    public boolean add(ObjId source, ObjId target) {<a name="line.197"></a>
<span class="sourceLineNo">198</span>        if (source == null)<a name="line.198"></a>
<span class="sourceLineNo">199</span>            throw new IllegalArgumentException("null source");<a name="line.199"></a>
<span class="sourceLineNo">200</span>        if (target == null)<a name="line.200"></a>
<span class="sourceLineNo">201</span>            throw new IllegalArgumentException("null target");<a name="line.201"></a>
<span class="sourceLineNo">202</span>        synchronized (this.lock) {<a name="line.202"></a>
<span class="sourceLineNo">203</span>            if (!ObjIdBiMultiMap.add(this.forward, source, target))<a name="line.203"></a>
<span class="sourceLineNo">204</span>                return false;<a name="line.204"></a>
<span class="sourceLineNo">205</span>            ObjIdBiMultiMap.add(this.reverse, target, source);<a name="line.205"></a>
<span class="sourceLineNo">206</span>            return true;<a name="line.206"></a>
<span class="sourceLineNo">207</span>        }<a name="line.207"></a>
<span class="sourceLineNo">208</span>    }<a name="line.208"></a>
<span class="sourceLineNo">209</span><a name="line.209"></a>
<span class="sourceLineNo">210</span>    /**<a name="line.210"></a>
<span class="sourceLineNo">211</span>     * Add multiple associations with a given source.<a name="line.211"></a>
<span class="sourceLineNo">212</span>     *<a name="line.212"></a>
<span class="sourceLineNo">213</span>     * @param source source ID<a name="line.213"></a>
<span class="sourceLineNo">214</span>     * @param targets target ID's<a name="line.214"></a>
<span class="sourceLineNo">215</span>     * @return true if any association was added, false if all associations already existed<a name="line.215"></a>
<span class="sourceLineNo">216</span>     * @throws IllegalArgumentException if {@code source}, {@code targets}, or any target in the iteration is null<a name="line.216"></a>
<span class="sourceLineNo">217</span>     */<a name="line.217"></a>
<span class="sourceLineNo">218</span>    public boolean addAll(ObjId source, Iterable&lt;? extends ObjId&gt; targets) {<a name="line.218"></a>
<span class="sourceLineNo">219</span><a name="line.219"></a>
<span class="sourceLineNo">220</span>        // Sanity check<a name="line.220"></a>
<span class="sourceLineNo">221</span>        if (source == null)<a name="line.221"></a>
<span class="sourceLineNo">222</span>            throw new IllegalArgumentException("null source");<a name="line.222"></a>
<span class="sourceLineNo">223</span>        if (targets == null)<a name="line.223"></a>
<span class="sourceLineNo">224</span>            throw new IllegalArgumentException("null targets");<a name="line.224"></a>
<span class="sourceLineNo">225</span><a name="line.225"></a>
<span class="sourceLineNo">226</span>        // Gather targets<a name="line.226"></a>
<span class="sourceLineNo">227</span>        final ObjIdSet addedTargets = ObjIdBiMultiMap.gather(targets);<a name="line.227"></a>
<span class="sourceLineNo">228</span>        if (addedTargets.isEmpty())<a name="line.228"></a>
<span class="sourceLineNo">229</span>            return false;<a name="line.229"></a>
<span class="sourceLineNo">230</span><a name="line.230"></a>
<span class="sourceLineNo">231</span>        // Update maps<a name="line.231"></a>
<span class="sourceLineNo">232</span>        boolean result = false;<a name="line.232"></a>
<span class="sourceLineNo">233</span>        synchronized (this.lock) {<a name="line.233"></a>
<span class="sourceLineNo">234</span>            final ObjIdSet targetSet = this.forward.get(source);<a name="line.234"></a>
<span class="sourceLineNo">235</span>            if (targetSet != null) {<a name="line.235"></a>
<span class="sourceLineNo">236</span>                assert !targetSet.isEmpty();<a name="line.236"></a>
<span class="sourceLineNo">237</span>                if (targetSet.size() &gt;= addedTargets.size())<a name="line.237"></a>
<span class="sourceLineNo">238</span>                    result = targetSet.addAll(addedTargets);<a name="line.238"></a>
<span class="sourceLineNo">239</span>                else {<a name="line.239"></a>
<span class="sourceLineNo">240</span>                    addedTargets.addAll(targetSet);<a name="line.240"></a>
<span class="sourceLineNo">241</span>                    this.forward.put(source, addedTargets);<a name="line.241"></a>
<span class="sourceLineNo">242</span>                    result = true;<a name="line.242"></a>
<span class="sourceLineNo">243</span>                }<a name="line.243"></a>
<span class="sourceLineNo">244</span>            } else {<a name="line.244"></a>
<span class="sourceLineNo">245</span>                this.forward.put(source, addedTargets);<a name="line.245"></a>
<span class="sourceLineNo">246</span>                result = true;<a name="line.246"></a>
<span class="sourceLineNo">247</span>            }<a name="line.247"></a>
<span class="sourceLineNo">248</span>            for (ObjId target : addedTargets)<a name="line.248"></a>
<span class="sourceLineNo">249</span>                ObjIdBiMultiMap.add(this.reverse, target, source);<a name="line.249"></a>
<span class="sourceLineNo">250</span>        }<a name="line.250"></a>
<span class="sourceLineNo">251</span><a name="line.251"></a>
<span class="sourceLineNo">252</span>        // Done<a name="line.252"></a>
<span class="sourceLineNo">253</span>        return result;<a name="line.253"></a>
<span class="sourceLineNo">254</span>    }<a name="line.254"></a>
<span class="sourceLineNo">255</span><a name="line.255"></a>
<span class="sourceLineNo">256</span>    /**<a name="line.256"></a>
<span class="sourceLineNo">257</span>     * Remove an association.<a name="line.257"></a>
<span class="sourceLineNo">258</span>     *<a name="line.258"></a>
<span class="sourceLineNo">259</span>     * @param source source ID<a name="line.259"></a>
<span class="sourceLineNo">260</span>     * @param target target ID<a name="line.260"></a>
<span class="sourceLineNo">261</span>     * @return true if association was removed, false if the association did not exist<a name="line.261"></a>
<span class="sourceLineNo">262</span>     * @throws IllegalArgumentException if {@code source} or {@code target} is null<a name="line.262"></a>
<span class="sourceLineNo">263</span>     */<a name="line.263"></a>
<span class="sourceLineNo">264</span>    public boolean remove(ObjId source, ObjId target) {<a name="line.264"></a>
<span class="sourceLineNo">265</span>        if (source == null)<a name="line.265"></a>
<span class="sourceLineNo">266</span>            throw new IllegalArgumentException("null source");<a name="line.266"></a>
<span class="sourceLineNo">267</span>        if (target == null)<a name="line.267"></a>
<span class="sourceLineNo">268</span>            throw new IllegalArgumentException("null target");<a name="line.268"></a>
<span class="sourceLineNo">269</span>        synchronized (this.lock) {<a name="line.269"></a>
<span class="sourceLineNo">270</span>            if (!ObjIdBiMultiMap.remove(this.forward, source, target))<a name="line.270"></a>
<span class="sourceLineNo">271</span>                return false;<a name="line.271"></a>
<span class="sourceLineNo">272</span>            ObjIdBiMultiMap.remove(this.reverse, target, source);<a name="line.272"></a>
<span class="sourceLineNo">273</span>            return true;<a name="line.273"></a>
<span class="sourceLineNo">274</span>        }<a name="line.274"></a>
<span class="sourceLineNo">275</span>    }<a name="line.275"></a>
<span class="sourceLineNo">276</span><a name="line.276"></a>
<span class="sourceLineNo">277</span>    /**<a name="line.277"></a>
<span class="sourceLineNo">278</span>     * Remove multiple associations with a given source.<a name="line.278"></a>
<span class="sourceLineNo">279</span>     *<a name="line.279"></a>
<span class="sourceLineNo">280</span>     * @param source source ID<a name="line.280"></a>
<span class="sourceLineNo">281</span>     * @param targets target ID's<a name="line.281"></a>
<span class="sourceLineNo">282</span>     * @return true if any association was removed, false if none of the specified associations existed<a name="line.282"></a>
<span class="sourceLineNo">283</span>     * @throws IllegalArgumentException if {@code source}, {@code targets}, or any target in the iteration is null<a name="line.283"></a>
<span class="sourceLineNo">284</span>     */<a name="line.284"></a>
<span class="sourceLineNo">285</span>    public boolean removeAll(ObjId source, Iterable&lt;? extends ObjId&gt; targets) {<a name="line.285"></a>
<span class="sourceLineNo">286</span><a name="line.286"></a>
<span class="sourceLineNo">287</span>        // Sanity check<a name="line.287"></a>
<span class="sourceLineNo">288</span>        if (source == null)<a name="line.288"></a>
<span class="sourceLineNo">289</span>            throw new IllegalArgumentException("null source");<a name="line.289"></a>
<span class="sourceLineNo">290</span>        if (targets == null)<a name="line.290"></a>
<span class="sourceLineNo">291</span>            throw new IllegalArgumentException("null targets");<a name="line.291"></a>
<span class="sourceLineNo">292</span><a name="line.292"></a>
<span class="sourceLineNo">293</span>        // Gather targets<a name="line.293"></a>
<span class="sourceLineNo">294</span>        final ObjIdSet removedTargets = ObjIdBiMultiMap.gather(targets);<a name="line.294"></a>
<span class="sourceLineNo">295</span>        if (removedTargets.isEmpty())<a name="line.295"></a>
<span class="sourceLineNo">296</span>            return false;<a name="line.296"></a>
<span class="sourceLineNo">297</span><a name="line.297"></a>
<span class="sourceLineNo">298</span>        // Update maps<a name="line.298"></a>
<span class="sourceLineNo">299</span>        boolean result = false;<a name="line.299"></a>
<span class="sourceLineNo">300</span>        synchronized (this.lock) {<a name="line.300"></a>
<span class="sourceLineNo">301</span>            final ObjIdSet targetSet = this.forward.get(source);<a name="line.301"></a>
<span class="sourceLineNo">302</span>            if (targetSet == null)<a name="line.302"></a>
<span class="sourceLineNo">303</span>                return false;<a name="line.303"></a>
<span class="sourceLineNo">304</span>            assert !targetSet.isEmpty();<a name="line.304"></a>
<span class="sourceLineNo">305</span>            for (ObjId target : removedTargets) {<a name="line.305"></a>
<span class="sourceLineNo">306</span>                if (targetSet.remove(target)) {<a name="line.306"></a>
<span class="sourceLineNo">307</span>                    final boolean removed = ObjIdBiMultiMap.remove(this.reverse, target, source);<a name="line.307"></a>
<span class="sourceLineNo">308</span>                    assert removed;<a name="line.308"></a>
<span class="sourceLineNo">309</span>                    result = true;<a name="line.309"></a>
<span class="sourceLineNo">310</span>                }<a name="line.310"></a>
<span class="sourceLineNo">311</span>            }<a name="line.311"></a>
<span class="sourceLineNo">312</span>            if (targetSet.isEmpty())<a name="line.312"></a>
<span class="sourceLineNo">313</span>                this.forward.remove(source);<a name="line.313"></a>
<span class="sourceLineNo">314</span>        }<a name="line.314"></a>
<span class="sourceLineNo">315</span><a name="line.315"></a>
<span class="sourceLineNo">316</span>        // Done<a name="line.316"></a>
<span class="sourceLineNo">317</span>        return result;<a name="line.317"></a>
<span class="sourceLineNo">318</span>    }<a name="line.318"></a>
<span class="sourceLineNo">319</span><a name="line.319"></a>
<span class="sourceLineNo">320</span>    /**<a name="line.320"></a>
<span class="sourceLineNo">321</span>     * Remove all associations involving the specified source.<a name="line.321"></a>
<span class="sourceLineNo">322</span>     *<a name="line.322"></a>
<span class="sourceLineNo">323</span>     * @param source source ID<a name="line.323"></a>
<span class="sourceLineNo">324</span>     * @return true if any {@code source} association(s) were removed, false if {@code source} had no target associations<a name="line.324"></a>
<span class="sourceLineNo">325</span>     * @throws IllegalArgumentException if {@code source} is null<a name="line.325"></a>
<span class="sourceLineNo">326</span>     */<a name="line.326"></a>
<span class="sourceLineNo">327</span>    public boolean removeSource(ObjId source) {<a name="line.327"></a>
<span class="sourceLineNo">328</span>        if (source == null)<a name="line.328"></a>
<span class="sourceLineNo">329</span>            throw new IllegalArgumentException("null source");<a name="line.329"></a>
<span class="sourceLineNo">330</span>        synchronized (this.lock) {<a name="line.330"></a>
<span class="sourceLineNo">331</span>            final ObjIdSet targets = this.forward.remove(source);<a name="line.331"></a>
<span class="sourceLineNo">332</span>            if (targets == null)<a name="line.332"></a>
<span class="sourceLineNo">333</span>                return false;<a name="line.333"></a>
<span class="sourceLineNo">334</span>            assert !targets.isEmpty();<a name="line.334"></a>
<span class="sourceLineNo">335</span>            for (ObjId target : targets) {<a name="line.335"></a>
<span class="sourceLineNo">336</span>                final ObjIdSet sources = this.reverse.get(target);<a name="line.336"></a>
<span class="sourceLineNo">337</span>                sources.remove(source);<a name="line.337"></a>
<span class="sourceLineNo">338</span>                if (sources.isEmpty())<a name="line.338"></a>
<span class="sourceLineNo">339</span>                    this.reverse.remove(target);<a name="line.339"></a>
<span class="sourceLineNo">340</span>            }<a name="line.340"></a>
<span class="sourceLineNo">341</span>        }<a name="line.341"></a>
<span class="sourceLineNo">342</span>        return true;<a name="line.342"></a>
<span class="sourceLineNo">343</span>    }<a name="line.343"></a>
<span class="sourceLineNo">344</span><a name="line.344"></a>
<span class="sourceLineNo">345</span>    /**<a name="line.345"></a>
<span class="sourceLineNo">346</span>     * Remove all associations involving the specified target.<a name="line.346"></a>
<span class="sourceLineNo">347</span>     *<a name="line.347"></a>
<span class="sourceLineNo">348</span>     * @param target target ID<a name="line.348"></a>
<span class="sourceLineNo">349</span>     * @return true if any {@code target} association(s) were removed, false if {@code target} had no source associations<a name="line.349"></a>
<span class="sourceLineNo">350</span>     * @throws IllegalArgumentException if {@code target} is null<a name="line.350"></a>
<span class="sourceLineNo">351</span>     */<a name="line.351"></a>
<span class="sourceLineNo">352</span>    public boolean removeTarget(ObjId target) {<a name="line.352"></a>
<span class="sourceLineNo">353</span>        return this.inverse().removeSource(target);<a name="line.353"></a>
<span class="sourceLineNo">354</span>    }<a name="line.354"></a>
<span class="sourceLineNo">355</span><a name="line.355"></a>
<span class="sourceLineNo">356</span>    /**<a name="line.356"></a>
<span class="sourceLineNo">357</span>     * Clear this instance.<a name="line.357"></a>
<span class="sourceLineNo">358</span>     */<a name="line.358"></a>
<span class="sourceLineNo">359</span>    public void clear() {<a name="line.359"></a>
<span class="sourceLineNo">360</span>        synchronized (this.lock) {<a name="line.360"></a>
<span class="sourceLineNo">361</span>            this.forward.clear();<a name="line.361"></a>
<span class="sourceLineNo">362</span>            this.reverse.clear();<a name="line.362"></a>
<span class="sourceLineNo">363</span>        }<a name="line.363"></a>
<span class="sourceLineNo">364</span>    }<a name="line.364"></a>
<span class="sourceLineNo">365</span><a name="line.365"></a>
<span class="sourceLineNo">366</span>    /**<a name="line.366"></a>
<span class="sourceLineNo">367</span>     * Get an inverse view backed by this instance.<a name="line.367"></a>
<span class="sourceLineNo">368</span>     *<a name="line.368"></a>
<span class="sourceLineNo">369</span>     * &lt;p&gt;<a name="line.369"></a>
<span class="sourceLineNo">370</span>     * The returned {@link ObjIdBiMultiMap} is a &lt;i&gt;view&lt;/i&gt; in which sources become targets and vice-versa;<a name="line.370"></a>
<span class="sourceLineNo">371</span>     * any changes are reflected back in this instance.<a name="line.371"></a>
<span class="sourceLineNo">372</span>     * &lt;/p&gt;<a name="line.372"></a>
<span class="sourceLineNo">373</span>     *<a name="line.373"></a>
<span class="sourceLineNo">374</span>     * &lt;p&gt;<a name="line.374"></a>
<span class="sourceLineNo">375</span>     * This method is efficient, requiring only constant time.<a name="line.375"></a>
<span class="sourceLineNo">376</span>     * &lt;/p&gt;<a name="line.376"></a>
<span class="sourceLineNo">377</span>     *<a name="line.377"></a>
<span class="sourceLineNo">378</span>     * @return inverse view of this instance<a name="line.378"></a>
<span class="sourceLineNo">379</span>     */<a name="line.379"></a>
<span class="sourceLineNo">380</span>    public ObjIdBiMultiMap inverse() {<a name="line.380"></a>
<span class="sourceLineNo">381</span>        return this.inverse != null ? this.inverse : new ObjIdBiMultiMap(this, this.reverse, this.forward);<a name="line.381"></a>
<span class="sourceLineNo">382</span>    }<a name="line.382"></a>
<span class="sourceLineNo">383</span><a name="line.383"></a>
<span class="sourceLineNo">384</span>// Object<a name="line.384"></a>
<span class="sourceLineNo">385</span><a name="line.385"></a>
<span class="sourceLineNo">386</span>    /**<a name="line.386"></a>
<span class="sourceLineNo">387</span>     * Calculate a hash code value for this instance.<a name="line.387"></a>
<span class="sourceLineNo">388</span>     */<a name="line.388"></a>
<span class="sourceLineNo">389</span>    @Override<a name="line.389"></a>
<span class="sourceLineNo">390</span>    public int hashCode() {<a name="line.390"></a>
<span class="sourceLineNo">391</span>        synchronized (this.lock) {<a name="line.391"></a>
<span class="sourceLineNo">392</span>            return this.forward.hashCode();<a name="line.392"></a>
<span class="sourceLineNo">393</span>        }<a name="line.393"></a>
<span class="sourceLineNo">394</span>    }<a name="line.394"></a>
<span class="sourceLineNo">395</span><a name="line.395"></a>
<span class="sourceLineNo">396</span>    /**<a name="line.396"></a>
<span class="sourceLineNo">397</span>     * Compare for equality.<a name="line.397"></a>
<span class="sourceLineNo">398</span>     */<a name="line.398"></a>
<span class="sourceLineNo">399</span>    @Override<a name="line.399"></a>
<span class="sourceLineNo">400</span>    public boolean equals(Object obj) {<a name="line.400"></a>
<span class="sourceLineNo">401</span>        if (obj == this)<a name="line.401"></a>
<span class="sourceLineNo">402</span>            return true;<a name="line.402"></a>
<span class="sourceLineNo">403</span>        if (obj == null || obj.getClass() != this.getClass())<a name="line.403"></a>
<span class="sourceLineNo">404</span>            return false;<a name="line.404"></a>
<span class="sourceLineNo">405</span>        final ObjIdBiMultiMap that = (ObjIdBiMultiMap)obj;<a name="line.405"></a>
<span class="sourceLineNo">406</span>        final ObjIdMap&lt;ObjIdSet&gt; thisForward;<a name="line.406"></a>
<span class="sourceLineNo">407</span>        final ObjIdMap&lt;ObjIdSet&gt; thatForward;<a name="line.407"></a>
<span class="sourceLineNo">408</span>        synchronized (this.lock) {<a name="line.408"></a>
<span class="sourceLineNo">409</span>            thisForward = ObjIdBiMultiMap.deepClone(this.forward);<a name="line.409"></a>
<span class="sourceLineNo">410</span>        }<a name="line.410"></a>
<span class="sourceLineNo">411</span>        synchronized (that.lock) {<a name="line.411"></a>
<span class="sourceLineNo">412</span>            thatForward = ObjIdBiMultiMap.deepClone(that.forward);<a name="line.412"></a>
<span class="sourceLineNo">413</span>        }<a name="line.413"></a>
<span class="sourceLineNo">414</span>        return thisForward.equals(thatForward);<a name="line.414"></a>
<span class="sourceLineNo">415</span>    }<a name="line.415"></a>
<span class="sourceLineNo">416</span><a name="line.416"></a>
<span class="sourceLineNo">417</span>    /**<a name="line.417"></a>
<span class="sourceLineNo">418</span>     * Create a {@link String} representation.<a name="line.418"></a>
<span class="sourceLineNo">419</span>     */<a name="line.419"></a>
<span class="sourceLineNo">420</span>    @Override<a name="line.420"></a>
<span class="sourceLineNo">421</span>    public String toString() {<a name="line.421"></a>
<span class="sourceLineNo">422</span>        synchronized (this.lock) {<a name="line.422"></a>
<span class="sourceLineNo">423</span>            return this.forward.toString();<a name="line.423"></a>
<span class="sourceLineNo">424</span>        }<a name="line.424"></a>
<span class="sourceLineNo">425</span>    }<a name="line.425"></a>
<span class="sourceLineNo">426</span><a name="line.426"></a>
<span class="sourceLineNo">427</span>// Cloneable<a name="line.427"></a>
<span class="sourceLineNo">428</span><a name="line.428"></a>
<span class="sourceLineNo">429</span>    /**<a name="line.429"></a>
<span class="sourceLineNo">430</span>     * Clone this instance.<a name="line.430"></a>
<span class="sourceLineNo">431</span>     */<a name="line.431"></a>
<span class="sourceLineNo">432</span>    @Override<a name="line.432"></a>
<span class="sourceLineNo">433</span>    @SuppressWarnings("unchecked")<a name="line.433"></a>
<span class="sourceLineNo">434</span>    public ObjIdBiMultiMap clone() {<a name="line.434"></a>
<span class="sourceLineNo">435</span>        final ObjIdBiMultiMap clone;<a name="line.435"></a>
<span class="sourceLineNo">436</span>        try {<a name="line.436"></a>
<span class="sourceLineNo">437</span>            clone = (ObjIdBiMultiMap)super.clone();<a name="line.437"></a>
<span class="sourceLineNo">438</span>        } catch (CloneNotSupportedException e) {<a name="line.438"></a>
<span class="sourceLineNo">439</span>            throw new RuntimeException(e);<a name="line.439"></a>
<span class="sourceLineNo">440</span>        }<a name="line.440"></a>
<span class="sourceLineNo">441</span>        synchronized (this.lock) {<a name="line.441"></a>
<span class="sourceLineNo">442</span>            clone.forward = ObjIdBiMultiMap.deepClone(clone.forward);<a name="line.442"></a>
<span class="sourceLineNo">443</span>            clone.reverse = ObjIdBiMultiMap.deepClone(clone.reverse);<a name="line.443"></a>
<span class="sourceLineNo">444</span>        }<a name="line.444"></a>
<span class="sourceLineNo">445</span>        return clone;<a name="line.445"></a>
<span class="sourceLineNo">446</span>    }<a name="line.446"></a>
<span class="sourceLineNo">447</span><a name="line.447"></a>
<span class="sourceLineNo">448</span>// Internal methods<a name="line.448"></a>
<span class="sourceLineNo">449</span><a name="line.449"></a>
<span class="sourceLineNo">450</span>    private static ObjIdSet gather(Iterable&lt;? extends ObjId&gt; ids) {<a name="line.450"></a>
<span class="sourceLineNo">451</span>        final ObjIdSet set = new ObjIdSet();<a name="line.451"></a>
<span class="sourceLineNo">452</span>        for (ObjId id : ids) {<a name="line.452"></a>
<span class="sourceLineNo">453</span>            if (id == null)<a name="line.453"></a>
<span class="sourceLineNo">454</span>                throw new IllegalArgumentException("encountered null ObjId in iteration");<a name="line.454"></a>
<span class="sourceLineNo">455</span>            set.add(id);<a name="line.455"></a>
<span class="sourceLineNo">456</span>        }<a name="line.456"></a>
<span class="sourceLineNo">457</span>        return set;<a name="line.457"></a>
<span class="sourceLineNo">458</span>    }<a name="line.458"></a>
<span class="sourceLineNo">459</span><a name="line.459"></a>
<span class="sourceLineNo">460</span>    private static boolean add(ObjIdMap&lt;ObjIdSet&gt; map, ObjId source, ObjId target) {<a name="line.460"></a>
<span class="sourceLineNo">461</span>        ObjIdSet set = map.get(source);<a name="line.461"></a>
<span class="sourceLineNo">462</span>        if (set == null) {<a name="line.462"></a>
<span class="sourceLineNo">463</span>            set = new ObjIdSet();<a name="line.463"></a>
<span class="sourceLineNo">464</span>            map.put(source, set);<a name="line.464"></a>
<span class="sourceLineNo">465</span>        }<a name="line.465"></a>
<span class="sourceLineNo">466</span>        return set.add(target);<a name="line.466"></a>
<span class="sourceLineNo">467</span>    }<a name="line.467"></a>
<span class="sourceLineNo">468</span><a name="line.468"></a>
<span class="sourceLineNo">469</span>    private static boolean remove(ObjIdMap&lt;ObjIdSet&gt; map, ObjId source, ObjId target) {<a name="line.469"></a>
<span class="sourceLineNo">470</span>        final ObjIdSet set = map.get(source);<a name="line.470"></a>
<span class="sourceLineNo">471</span>        if (set == null || !set.remove(target))<a name="line.471"></a>
<span class="sourceLineNo">472</span>            return false;<a name="line.472"></a>
<span class="sourceLineNo">473</span>        if (set.isEmpty())<a name="line.473"></a>
<span class="sourceLineNo">474</span>            map.remove(source);<a name="line.474"></a>
<span class="sourceLineNo">475</span>        return true;<a name="line.475"></a>
<span class="sourceLineNo">476</span>    }<a name="line.476"></a>
<span class="sourceLineNo">477</span><a name="line.477"></a>
<span class="sourceLineNo">478</span>    private static ObjIdMap&lt;ObjIdSet&gt; deepClone(ObjIdMap&lt;ObjIdSet&gt; map) {<a name="line.478"></a>
<span class="sourceLineNo">479</span>        final ObjIdMap&lt;ObjIdSet&gt; clone = map.clone();<a name="line.479"></a>
<span class="sourceLineNo">480</span>        final int numSlots = map.getKeys().length;<a name="line.480"></a>
<span class="sourceLineNo">481</span>        for (int i = 0; i &lt; numSlots; i++) {<a name="line.481"></a>
<span class="sourceLineNo">482</span>            final ObjIdSet set = map.getValue(i);<a name="line.482"></a>
<span class="sourceLineNo">483</span>            if (set != null)<a name="line.483"></a>
<span class="sourceLineNo">484</span>                map.setValue(i, set.clone());<a name="line.484"></a>
<span class="sourceLineNo">485</span>        }<a name="line.485"></a>
<span class="sourceLineNo">486</span>        return clone;<a name="line.486"></a>
<span class="sourceLineNo">487</span>    }<a name="line.487"></a>
<span class="sourceLineNo">488</span>}<a name="line.488"></a>
<span class="sourceLineNo">489</span><a name="line.489"></a>




























































</pre>
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